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x + 15%x = 675zl
x = 100%
100%x + 15%x = 675zl
x(100% + 15%) = 675zl
x115% = 675
x = 675zl/115% * 100% = 586,96zl
Przed podwyzka tablet kosztowal 586,96zl
xzł- 100%
x==587zł